What is Java and features of java?

Sun Microsystems, which is now owned by Oracle, created the Java programming language in 1995. Java applications operate on every platform on the common basis of adhering to the “Write Once, Run Anywhere” principle through a Java Virtual Machine (JVM). Today, Java is something of a ubiquitous programming language and finds its applications in any and all embedded systems, enterprise applications, mobile applications (Android), and development of web applications. Its advantages are that it boasts great safety features, automatic memory management, and multi-threading capabilities. It still stands out as one of the most commonly known programming languages by developers around the world thanks to its extensive library and frameworks. an object-oriented, high-level programming language created by Sun Microsystems, which is currently owned by Oracle. It is frequently used to create enterprise-level software, mobile applications, and web applications.

what are the Features of Java?

Platform Independent: WORA stands for “write once, run anywhere.”

Object-Oriented: Uses OOP concepts such as abstraction, encapsulation, inheritance, and polymorphism.

Secure: Provides security features and runtime checks.

Multiple threads can be executed concurrently thanks to multithreading.

Robust: Excellent handling of exceptions and memory management.

High Performance: Optimizes using a Just-In-Time (JIT) compiler.

how to Install Java in Your system?

• Download and install the latest Java Development Kit (JDK) from Oracle or OpenJDK.
• Set up Environment Variables (JAVA_HOME and PATH).
• Verify installation using:
• java -version

What are the Fundamentals of java?

Java Syntax and Structure:

A basic Java program structure:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

Variables and Data Types In java?

Java has different types of variables to store data values. Data types are primarily classified into two categories: primitive data types and reference data types.

Primitive Data Types

The primitive data types represent the most basic types that, in turn, store simple values.

byte (1 byte): It stores the whole numbers from -128 to +127.

short (2 bytes): It stores whole numbers from -32,768 to +32,767.

int (4 bytes): It stores whole numbers ranging from -2^31 to 2^31-1.

long (8 bytes): It stores large whole numbers ranging from -2^63 to 2^63-1.

float (4 bytes): It stores fractional numbers with up to 7 decimal digits.

double (8 bytes): It stores fractional numbers with up to 16 decimal digits.

char (2 bytes): It stores a single character.

boolean (1 bit): It stores true or false.

Reference Data Types in java

Reference data types are used to store objects that are not predefined in Java.

Strings (String): For storing text.

Arrays (int[], double[], etc.): For storing multiple values of the same type.

Objects (Instances of user-defined classes).

what are the Operators in Java?

👉Here is Detail guide for Java Operators In 2025

Operators in Java are special symbols or keywords that carry out operations on variables and values. Considering that Java has many operators, operations like arithmetic calculation, comparisons, and logical evaluation, among other things can be performed….Java operators can be essentially classified into these categories:

• Arithmetic: +, -, *, /, %
• Relational: ==, !=, >, <, >=, <=
• Logical: &&, ||, !
• Assignment: =, +=, -=, *=, /=
• Bitwise: &, |, ^, ~, <<, >>

Control Flow Statements of java?

Conditional Statements in java

if (condition) {
    // Code
} else if (condition) {
    // Code
} else {
    // Code
}

java Looping Statements

for (int i = 0; i < 5; i++) {
    System.out.println(i);
}
while (condition) {
    // Code
}
do {
    // Code
} while (condition);

Arrays and Strings in java?

Arrays

int[] arr = {1, 2, 3, 4};

Strings

Sing s = "Hello";
System.out.println(s.length());tr

what is the Object-Oriented Programming (OOP) in java?

Object-Oriented Programming (OOP) is a paradigm in software programming based on objects instead of functions or logic. It has four basic principles.

Classes and Objects in java

class Car {
    String model;
    Car(String model) {
        this.model = model;
    }
}

Inheritance in Java

class Vehicle {}
class Car extends Vehicle {}

java Polymorphism example

class Animal {
    void sound() { System.out.println("Animal makes a sound"); }
}
class Dog extends Animal {
    void sound() { System.out.println("Bark"); }
}

Exception Handling in java

try {
    int x = 10 / 0;
} catch (ArithmeticException e) {
    System.out.println("Cannot divide by zero");
} finally {
    System.out.println("Execution completed");
}

Collections Framework in java

• list (ArrayList, LinkedList)
• Set (HashSet, TreeSet)
• Map (HashMap, TreeMap)

File Handling in java

File file = new File("test.txt");
FileWriter fw = new FileWriter(file);
fw.write("Hello, Java!");
fw.close();

java Multithreading concept

class MyThread extends Thread {
public void run() {
System.out.println(“Thread is running”);
}
}